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GPOTool: DS and Sysvol Version Mismatch

Question

First some background: We have three DCs: the PDC role is on DC1 (Windows Server 2008 x64) in Site_A and DC2 (Windows Server 2008 R2 x64) and DC3 (Windows Server 2008 R2 x64) are in Site_B. Site_A and Site_B are connected with a dedicated 1GB fibre link. Connectivity between all of the DCs seems okay (ping <1ms; SMB/RPC access works).

I have read the advice from Miles Zhang from another post (http://social.technet.microsoft.com/Forums/en/winserverGP/thread/019d27df-fdb7-41f6-a88f-275be24f8275) but this seems to assume that the version mismatch is on the PDC however this does not seem to be the case for me: the DS and Sysvol versions match on the PDC but not on the other DCs.

Now it is possible that at some point the PDC role was pushed from DC1 to DC2 or DC3 and has since been pushed back. My question is what can I do to diagnose why replication between DC1 and DC2/DC3 is not working (I am having some trouble getting repadmin to show me anything meaningful) and how can I force DC2/DC3 to pick up the latest version of the Group Policy?

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